Tortilla Soup

1 T olive oil
4 cloves garlic
1 t chili powder
2 cans diced tomatoes with juice
3-4 cups cooked black beans
1 can chicken broth
1 package frozen corn
1 cup crushed tortilla chips
1 T fresh lime juice
sour cream

Heat oil, cook garlic and chili powder until fragrant, about one minute. Add tomatoes, beans, broth, corn, 1 cup water, and salt to taste. Bring to a boil and reduce to a simmer. Add tortilla chips and cook about 2 minutes more. Remove from heat and stir in the lime juice. Serve with more chips, extra lime juice, and a dollop of sour cream.